I have started using Ultra Pro trading card pages that hold 9 cards each (Stock number 83000). They are PVC and acid free. I buy them 10 pages for $2.00 at Hobby Lobby. This allows me to use regular 3 ring binders to store the cards. The cards are too loose in the pages as is, so I use individual card sleeves available at any sports card shop at about $.75 per 100 sleeves. I also now have all of my trader cards in the individual sleeves. It is amazing how easy it is to put small scratches and mars on the cards, and this protects them all from that.